<docs>
---
order: 13
title:
  zh-CN: 自定义渲染对话框
  en-US: Custom modal content render
---

## zh-CN

自定义渲染对话框, 可通过 `vueuse` 来实现拖拽。

## en-US

Custom modal content render. use `vueuse` implements draggable.

</docs>
<template>
  <div>
    <a-button type="primary" @click="showModal">Open Modal</a-button>
    <a-modal ref="modalRef" v-model:open="open" :wrap-style="{ overflow: 'hidden' }" @ok="handleOk">
      <p>Some contents...</p>
      <p>Some contents...</p>
      <p>Some contents...</p>
      <template #title>
        <div ref="modalTitleRef" style="width: 100%; cursor: move">Draggable Modal</div>
      </template>
      <template #modalRender="{ originVNode }">
        <div :style="transformStyle">
          <component :is="originVNode" />
        </div>
      </template>
    </a-modal>
  </div>
</template>
<script lang="ts" setup>
import { ref, computed, CSSProperties, watch, watchEffect } from 'vue';
import { useDraggable } from '@vueuse/core';
const open = ref<boolean>(false);
const modalTitleRef = ref<HTMLElement>(null);
const showModal = () => {
  open.value = true;
};
const { x, y, isDragging } = useDraggable(modalTitleRef);
const handleOk = (e: MouseEvent) => {
  console.log(e);
  open.value = false;
};
const startX = ref<number>(0);
const startY = ref<number>(0);
const startedDrag = ref(false);
const transformX = ref(0);
const transformY = ref(0);
const preTransformX = ref(0);
const preTransformY = ref(0);
const dragRect = ref({ left: 0, right: 0, top: 0, bottom: 0 });
watch([x, y], () => {
  if (!startedDrag.value) {
    startX.value = x.value;
    startY.value = y.value;
    const bodyRect = document.body.getBoundingClientRect();
    const titleRect = modalTitleRef.value.getBoundingClientRect();
    dragRect.value.right = bodyRect.width - titleRect.width;
    dragRect.value.bottom = bodyRect.height - titleRect.height;
    preTransformX.value = transformX.value;
    preTransformY.value = transformY.value;
  }
  startedDrag.value = true;
});
watch(isDragging, () => {
  if (!isDragging) {
    startedDrag.value = false;
  }
});

watchEffect(() => {
  if (startedDrag.value) {
    transformX.value =
      preTransformX.value +
      Math.min(Math.max(dragRect.value.left, x.value), dragRect.value.right) -
      startX.value;
    transformY.value =
      preTransformY.value +
      Math.min(Math.max(dragRect.value.top, y.value), dragRect.value.bottom) -
      startY.value;
  }
});
const transformStyle = computed<CSSProperties>(() => {
  return {
    transform: `translate(${transformX.value}px, ${transformY.value}px)`,
  };
});
</script>
